<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

 <head>

  <title>CSS Reftest Reference</title>
  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />

  <style type="text/css"><![CDATA[
  body
  {
  background-color: navy;
  border: blue solid;
  color: white;
  margin: 1em;
  padding: 2em;
  }

  div
  {
  background: green url("support/square-purple.png") no-repeat fixed center;
  border: lime solid;
  padding: 3em;
  }
  ]]></style>

 </head>

 <body>

  <div>In the exact middle of this page, there should be a purple tile. The tile must only be visible when the green box overlaps the tile; it must be hidden when overlapping the blue background. Resizing the window should keep the position of the purple tile in the center of the viewport, but the tile should still only be visible inside this dark green box.</div>

 </body>
</html>
